Banz- caloric restriction to that degree will only produce short term results, the highest estimation I've seen is two weeks before leptin crashes, you're basically downshifting metabolism and setting yourself up for a rebound.
lifestyle modification is what will bfing your success. even after a decade of "trying" my biggest weakness is planning, the book we referenced has a plan for that. I know when my day will be stressful, wnay I need to do, etc. yet I struggle having things ready. The old Bill Phillips line is very wise, "failing to plan is planning to fail." Habit I'm practicing now to change, my #1 priority in this dimension of my health.
in your case you sound like you know what your triggers are, so planNing is going to be key I think (from the few details we read). You know where you'll be going, plan a trip to the store, have options with you, find restaurants ahead of time and decide EXACTLY what to order, you won't be tempted that way when tired and your brain is burging for instant glucose.
tim Ferriss offers awesome travel advice. There services that deliver food to your hotel, to compliment the satisfying snacks you have with you. Dont deprive yourself, savor better options, don't be perfect, just better each time. We ALL have the option of eating a meal slowly, being focused on each bite, no cell phones, TV etc., making a meal last and savoring it. at any given time we can choose to breath diaphragmatically.
if you're REALLY struggling there's awesome regimens for using specific amino acids to help balance the brain chemistry from several well regarded books.
One quick personal note aside from the planning issue I'm rectifting (which by the way thanks to all as I will be doing so after this thread